Title: Suppressing electromagnetic local density of states via slow light in lossy quasi-1d gratings Show Chinese title

Title: 通过损耗准一维光栅中的慢光抑制电磁局域态密度

Abstract: We propose a spectral-averaging procedure that enables computation of bandwidth-integrated local density of states (LDOS) from a single scattering calculation, and exploit it to investigate the minimum extinction achievable from dipolar sources over finite bandwidths in structured media. Structure-agnostic extinction bounds are derived, providing analytical insights into scaling laws and fundamental design tradeoffs with implications to bandwidth and material selection. We find that perfect LDOS suppression over a finite bandwidth $\Delta\omega$ is impossible. Inspired by limits which predict nontrivial $\sqrt{\Delta\omega}$ scaling in systems with material dissipation, we show that pseudogap edge states of quasi-1d bullseye gratings can -- by simultaneously minimizing material absorption and radiation -- yield arbitrarily close to perfect LDOS suppression in the limit of vanishing bandwidth. Show Chinese abstract

Abstract: 我们提出一种谱平均过程，使能够从单个散射计算中计算带宽积分的局域态密度（LDOS），并利用它来研究在结构介质中从偶极子源在有限带宽下的最小消光。 结构无关的消光界限被推导出来，提供了关于尺度定律和基本设计权衡的分析见解，对带宽和材料选择有影响。 我们发现，在有限带宽 $\Delta\omega$ 内实现完美的LDOS抑制是不可能的。 受预测系统中材料耗散时出现非平凡 $\sqrt{\Delta\omega}$ 尺度的限制启发，我们表明准一维靶心光栅的伪带隙边缘态——通过同时最小化材料吸收和辐射——在带宽趋近于零的极限下可以实现接近完美的LDOS抑制。